
/*
 * Janino - An embedded Java[TM] compiler
 *
 * Copyright (c) 2001-2010 Arno Unkrig. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
 * following conditions are met:
 *
 *    1. Redistributions of source code must retain the above copyright notice, this list of conditions and the
 *       following disclaimer.
 *    2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
 *       following disclaimer in the documentation and/or other materials provided with the distribution.
 *    3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote
 *       products derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.codehaus.commons.compiler.samples;

import org.codehaus.commons.compiler.CompilerFactoryFactory;
import org.codehaus.commons.compiler.IExpressionEvaluator;

/**
 * Sample application which demonstrates how to use the {@link IExpressionEvaluator} class.
 */
public final
class ShippingCost {

    private ShippingCost() {}

    /***/
    public static void
    main(String[] args) throws Exception {

        if (args.length != 1) {
            System.err.println("Usage: <total>");
            System.err.println("Computes the shipping costs from the double value \"total\".");
            System.err.println("If \"total\" is less than 100.0, then the result is 7.95, else the result is 0.");
            System.exit(1);
        }

        // Convert command line argument to call argument "total".
        Object[] arguments = { new Double(args[0]) };

        // Create "ExpressionEvaluator" object.
        IExpressionEvaluator ee = (
            CompilerFactoryFactory
            .getDefaultCompilerFactory(ShippingCost.class.getClassLoader())
            .newExpressionEvaluator()
        );
        ee.setExpressionType(double.class);
        ee.setParameters(new String[] { "total" }, new Class[] { double.class });
        ee.cook("total >= 100.0 ? 0.0 : 7.95");

        // Evaluate expression with actual parameter values.
        Object res = ee.evaluate(arguments);

        // Print expression result.
        System.out.println("Result = " + String.valueOf(res));
    }
}
